Passive PoE is what is used by the Alix boards, Ubiquiti APs, etc. It simply sends DC over 4/5 and has return on 7/8 and can range anywhere from 5-24V depending on the device (most are in the 15-20V range). Using a Passive PoE adapter with a non-PoE device can cause a lot of damage.

802.3af is what you're going to get out of a PoE switch. It is commonly used for IP Phones, security cameras, name-brand wireless access points, etc. It runs 48V DC and has a detection process where power is only provided to a device that needs it, meaning you can use a PoE switch with non-PoE devices.

If you want to use a device that requires Passive PoE with an 802.3af PoE switch, you can use an adapter like this:

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